By the periodic table’s logic, all d-block elements should have filled s orbitals. But copper defies that logic. It should have the electron configuration [Ar] 3d 9 4s 2 .

The periodic table is not just the story of discoveries aided by better technological ... The classic example is of iodine (atomic mass 126.9) and tellurium (127.6). In terms of atomic ...

Can you name everything from Ac to Zr? Test your knowledge of the periodic table and see if you can top the leaderboard ...

Last May we added two new elements, Livermorium and Flerovium, to the periodic able after being first synthesized over a decade ago. Adding new elements to the periodic table is rare, not that we ...

Whether you need to brush up on your chemistry, or just love it when someone sets the Periodic Table to music, AsapSCIENCE’s The NEW Periodic Table Song is for you. This rundown of the elements ...

Periodic Table as Arranged by Mendelejeff attention to the fact that “the eighth element, starting from a given one, is a kind of repetition of the first, like the eighth note of an octave in ...

Astronomers have discovered the element tellurium, a rarity on Earth, in three ancient stars on the edge of our Milky Way galaxy. The find helps prove theories on heavy elements in the universe.

Then along came Rutherford, Bohr, and Moseley, in the years 1911–1914, and scientists found that the place of an element on the periodic table (atomic number) was not just a voodoo hack-up, like ...

T he periodic table stares down from the walls of just about every chemistry lab. The credit for its creation generally goes to Dimitri Mendeleev, a Russian chemist who in 1869 wrote out the known ...

Think of bismuth as the Cinderella of the periodic table. Because it is surrounded by its toxic stepsiblings—the elements lead, tin, antimony, tellurium, and polonium—chemists often overlook ...

Today, the periodic table is organized by atomic number, which is the number of protons in the nucleus. But they didn’t know about protons then, so they organized everything by atomic weight.